UMass Amherst KIN 460 - 13-Neural Control of Posture and Balance (46 pages)

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13-Neural Control of Posture and Balance



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13-Neural Control of Posture and Balance

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Pages:
46
School:
University of Massachusetts Amherst
Course:
Kin 460 - Motor Control

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What determines stable upright posture Questions What are the vestibular system contributions to posture What are the somatosensory contributions to posture What are the visual contributions to posture What is the role of the brainstem in postural control How do the muscle respond to postural disturbances POSTURAL CONTROL POSTURAL ORIENTATION posture POSTURAL STABILITY equilibrium balance Alignment of body segments Body s orientation in the environment Control of centre of mass COM relative to base of support BOS Postural muscles and the ideal postural configuration Postural stability If an object falls over or not is entirely a matter of the vertical projection of its center of gravity relative to its supports If this line of projection X lies within the area defined by the points of contact with the ground the support area the object does not fall left center If X lies outside this critical area then the system is unstable and any further tilting will cause an ever increasing rotational force that will make the object fall right Red arrows represent the differences of pressure at different points of support The man clearly has an excellent upright posture but is equally clearly about to experience a postural disaster because the vertical projection of his center of gravity lies outside his region of contact with his support What determines stable upright posture Questions What are the vestibular system contributions to posture What are the somatosensory contributions to posture What are the visual contributions to posture What is the role of the brainstem in postural control How do the muscle respond to postural disturbances Vestibular contribution to Control of upright stance Otolith receptors Static response and population coding head orientation Phasic response linear acceleration deceleration Semicircular canals Phasic response angular acceleration deceleration Left versus right response direction of head movement VOR coordinates eye head movements Otolith



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